At a school, there were 50 children from Club S and 30% less children from Club T. Some children joined Club T and the ratio of the number of children from Club S to the number of children from Club T became 5 : 4. How many children joined Club T?
| |
Club S |
Club T |
| Before |
50 |
35 |
| Change |
|
+ ? |
| After |
5 u |
4 u |
Number of children from Club T at first in percent
= 100% - 30%
= 70%
Number of children from Club T at first
= 70% x 50
=
70100 x 50
= 35
Number of children in Club S remains unchanged.
5 u = 50
1 u = 50 ÷ 5 = 10
Number of children from Club T in the end
= 4 u
= 4 x 10
= 40
Number of children joined Club T
= 40 - 35
= 5
Answer(s): 5
